<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>lesson 15</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
    <div id="root"></div>
</body>

</html>
<script>
    const app = Vue.createApp({
        data() {
            return {
                number: 666
            };
        },
        template: `
        <div>
            <test :content="number" />
        </div>
        `
    });
    // type：String，Boolean，Function，Array，Object
    // required  必填
    // default  默认值
    app.component('test', {
        props: {
            content: {
                type: Number,
                validator: function (value) {
                    return value < 1000;
                },
                default: function () {
                    return 888
                }
            }
        },
        template: `<div>{{content}}</div>`
    })
    const vm = app.mount("#root")
</script>